Question

If x cos A - y sin A = a; x sin A + y cos A = b, then

x^2 - y^2 = a^2 - b^2
x^2 + y^2 = a^2 + b^2
x^2 - y^2 = a^2 + b^2
x^2 + y^2 = a^2 - b^2​

Answer 1

Answer:

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Step-by-step explanation

Answer 2

Step-by-step explanation:

${x}^{2} + {y}^{2}$ =a2+b2